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Assessment of various rotor tip geometries on a single stage gas turbine performance

机译：在单级燃气轮机性能上评估各种转子尖端的几何形状

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Tip leakage loss introduces major part of losses of the rotor in axial gas turbines. Therefore, the rotor blade tip has a considerable effect on rotor efficiency. To understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). Various blade tip configurations such as squealers and extensions on both pressure and suction sides, partial PS-squealer and flat tip with various tip clearances are generated. The computational domains are generated using unstructured prism layers for boundary layer resolution and unstructured, tetrahedral mesh for main flow. By using a finite volume CFD solver capable of solving RANS equations in an unstructured domain, the transonic compressible flow in the domain is solved. To capture the turbulent field in blade tip, shear stress transport (SST) k-ω model is employed. By using mixing plane approach, it is possible to couple outlet boundary of stator and inlet boundary of rotor and investigate the stator-rotor interaction in the rotor flow field and its consequence tip leakage flow. To investigate the combined effects of active and passive flow control measures in blade tip region, we simulate baseline geometry with and without tip coolant to show the effects of geometrical features of the rotor tip as well as the effect of tip coolant mass flow rate. Taking into account various rotor tip configurations and their tip leakage losses, it is possible to propose an optimum configuration.
机译：尖端泄漏损失在轴向燃气涡轮机中引入了转子损失的主要部分。因此，转子叶片尖端对转子效率具有相当大的影响。为了了解转子尖端泄漏的流动物理特性，我们求解了不同尖端平台的流场（被动流量控制），并考虑了冷却剂尖端喷射（主动流量控制）。产生了各种叶片尖端配置，例如，在压力侧和吸力侧均设有刮水器和延伸部分，具有各种叶尖间隙的部分PS刮水器和扁平尖端。计算域是使用非结构化棱镜层（用于边界层分辨率）和非结构化四面体网格（用于主流）生成的。通过使用能够在非结构域中求解RANS方程的有限体积CFD求解器，可以求解该域中的跨音速可压缩流。为了捕获叶尖中的湍流场，采用了剪切应力传递（SST）k-ω模型。通过使用混合平面方法，可以将定子的出口边界与转子的入口边界耦合，并研究转子流场中的定子-转子相互作用以及其后果，即尖端泄漏流。为了研究叶片尖端区域中主动和被动流量控制措施的组合效果，我们模拟了带有和不带有尖端冷却剂的基线几何形状，以显示转子尖端的几何特征以及尖端冷却剂质量流量的影响。考虑到各种转子尖端构造及其尖端泄漏损失，可以提出最佳构造。

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